Cleanup forward declarations.

core/include/fpdfapi/fpdf_objects.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef CORE_INCLUDE_FPDFAPI_FPDF_OBJECTS_H_
 #define CORE_INCLUDE_FPDFAPI_FPDF_OBJECTS_H_
 
 #include <map>
 #include <set>
 
 #include "core/include/fxcrt/fx_coordinates.h"
 #include "core/include/fxcrt/fx_system.h"
 
 class CPDF_Array;
 class CPDF_Boolean;
-class CPDF_CryptoHandler;
 class CPDF_Dictionary;
-class CPDF_Document;
 class CPDF_IndirectObjectHolder;
 class CPDF_Name;
 class CPDF_Null;
 class CPDF_Number;
 class CPDF_Parser;
 class CPDF_Reference;
 class CPDF_Stream;
 class CPDF_StreamAcc;
-class CPDF_StreamFilter;
 class CPDF_String;
 class IFX_FileRead;
 
 class CPDF_Object {
  public:
   enum Type {
     BOOLEAN = 1,
     NUMBER,
     STRING,
     NAME,
@@ skipping 555 matching lines @@
   iterator end() { return m_IndirectObjs.end(); }
   const_iterator end() const { return m_IndirectObjs.end(); }
 
  protected:
   CPDF_Parser* m_pParser;
   FX_DWORD m_LastObjNum;
   std::map<FX_DWORD, CPDF_Object*> m_IndirectObjs;
 };
 
 #endif  // CORE_INCLUDE_FPDFAPI_FPDF_OBJECTS_H_